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Note 10 - Line of Credit and Long-Term Debt (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 50,000,000 |  |
Line of Credit Facility, Increase, Additional Borrowings | 50,000,000 |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.25% |  |  |  |
Line of Credit Facility, Amount Outstanding |  | 24,000,000 | 24,000,000 | 0 | 1,800,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases |  |  | 24,200,000 | 48,200,000 |
Debt Instrument, Basis Spread on Variable Rate |  |  | 1.75% |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.25% |  |
Proceeds from Sale of Short-term Investments |  | 27,700,000 |  |  |
Mortgage Loans on Real Estate |  |  | 262,000 | 336,000 |
Mortgage Loans on Real Estate, Interest Rate |  |  | 3.50% |  |
Debt Instrument Term |  |  | 15 years |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages |  |  | 262,000 |  |
Due to Related Parties, Noncurrent |  |  | 500,000 |  |
TSC Headquarters [Member] |  |  |  |  |
Mortgage Loans on Real Estate |  |  | $ 1,100,000 |  |

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